共查询到20条相似文献，搜索用时 703 毫秒
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温巍 《襄樊职业技术学院学报》2010,9(3):25-27,32
介绍了基于智能网络的LED光源系统的硬件结构及软件监控系统,通过与传统高压钠灯及普通LED灯的对比,阐释了该系统在节能技术上的独特优势,提出了智能网络型LED光源系统在节能型社会建设进程中的重要作用。 相似文献
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《实验室研究与探索》2015,(11)
设计和制作了一套三色LED灯的恒流驱动电路。采用恒流源驱动方式,LED上流过的电流将不受电压和环境温度变化,以及LED参数离散性的影响,从而能充分发挥LED的各种优良特性。主要通过数控直流恒流源实现对4只三色LED灯的控制,每只LED灯的单色流经额定电流为100 m A,并具有调色温和过流保护功能。还采用AT89S52单片机、AD、DA模块实现电压采样,1602液晶可显示LED中某单色支路的当前电流值,并加入声控模块来实现LED变色效果。 相似文献
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熊月 《中小学实验与装备》2012,(5):31
1实验器材凸透镜(焦距为5cm),"4"字的LED灯,光屏,带刻尺的光具座("0"点在中间的对称性刻尺)等。2实验装置如图1所示为凸透镜成像实验的装置示意图。"4"字形的LED灯由7个LED并联组成图形,电源采用4个串联的电压为1.2V钮扣电池组成,采用一个开关控制LED灯的开与关。 相似文献
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《山西教育(综合版)》2014,(9)
正实验材料:铜片、锌片、导线各若干,LED灯一个,四个西红柿实验步骤:1.将LED灯分别连接在两根导线的一端,在这两根导线的另一端分别接上一片锌片和一片铜片(注意LED灯长脚连接铜片),在其他三根导线两端各连接一片锌片和一片铜片。2.取四个西红柿,依次摆在桌子上。如果西红柿较硬,可以反复揉捏,使其变软。 相似文献
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付贤政 《广西教育学院学报》2011,(2):174-176
本文介绍了车载LED的发展现状,对LED组合灯的设计要求、驱动类型、拓扑结构的分类和调光方式的选择做了综述,重点介绍了拓扑结构和调光方式,强调了驱动设计需要注意的问题,展望了车用LED组合灯及驱动电路设计的发展前景。 相似文献
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盘思乐 《深圳信息职业技术学院学报》2011,(3):15-18
本文开发了基于键盘板数码管、LED灯以及按键的自动化测试系统,该系统采集键盘板数码管和LED灯的实时图像,能够识别数码管各段是否正常工作,并分析各个LED灯的颜色,亮度以进行分析判断;利用模拟按键动作来判断按键是否正常工作。解决了以往人工检测,效率较低且容易出现误判的问题。本文利用图像处理中边缘检测手段以实现自动判断多个数码管的位置,实现自动检测,从而大大提高了检测效率和准确性。 相似文献
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在音频频率电平指示器中,采用OP07构成输入放大电路,对输入或采样的音频信号进行放大,放大后的音频信号经10频段音频带通滤波器在50Hz～10kHz内进行分频,各频段所得信号经放大后独立控制一组10LED灯,以每频段灯亮的数目来表示该频段信号的强弱。经测试,该系统10频段分频准确,所控制的LED灯亮数目和亮度符合设计要求。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献
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The awareness of individualism can be traced back to the period of American Revolution when the Declaration of Independence was produced.It expressed basic beliefs concerning freedom,equality,democracy,privacy and the relationship between people and government,which were exactly what the philosophy of individualism mostly dealt with at that time.This paper is to exploit the essence of individualism by analyzing the Declaration .The analysis enables us to reconsider its significance to the issue of America human rights and foreign policies. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献